package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    private final DishMapper dishMapper;
    private final DishFlavorMapper dishFlavorMapper;
    private final SetmealDishMapper setmealDishMapper;
    private final SetmealMapper setmealMapper;

    @Autowired
    public DishServiceImpl(DishMapper dishMapper, DishFlavorMapper dishFlavorMapper, SetmealDishMapper setmealDishMapper, SetmealMapper setmealMapper) {
        this.dishMapper = dishMapper;
        this.dishFlavorMapper = dishFlavorMapper;
        this.setmealDishMapper = setmealDishMapper;
        this.setmealMapper = setmealMapper;
    }

    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        //向菜品表插入数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);

        //获取菜品id(Mybatis主键返回)
        Long dishId = dish.getId();

        //向口味表插入一条或多条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && !flavors.isEmpty()){
            flavors.forEach(flavor -> flavor.setDishId(dishId));
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public PageResult<DishVO> pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.selectPage(dishPageQueryDTO);
        page.close();
        return new PageResult<>(page.getTotal(), page.getResult());
    }

    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断是否存在起售中的菜品
        ids.forEach(id -> {
            Dish dish = dishMapper.getById(id);
            if (Objects.equals(dish.getStatus(), StatusConstant.ENABLE)){
                // 菜品起售中，无法删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });

        //判断菜品是否关联套餐
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && !setmealIds.isEmpty()){
            //菜品被套餐关联，无法删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品数据
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);

    }

    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);

        //封装VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //更新添加口味
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && !flavors.isEmpty()){
            flavors.forEach(flavor -> flavor.setDishId(dishDTO.getId()));
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    @Override
    @Transactional
    public void changeStatus(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (Objects.equals(status, StatusConstant.DISABLE)) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && !setmealIds.isEmpty()) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);
        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
